Many manufacturers of hardware and software produce stuff that is crippled in it's use and with locked features, like mp3-players that only cooperate with certain software or os's. They don't want the customer to use it as freely as the custumer wants it.
But there are clever nerds, who use their creative talents to liberate those products from their chains, so users, who paid for a fully-functional item, can fully enjoy it.
Sometimes these 'hackers' go even further and turn something in a completely different thing, with funny results.
There are special websites dedicated to this and 'Hackaday' is one of them
hack a day - www.hackaday.com _
Freedom for all!